Access to sources of clean, healthy water is a prerequisite for the survival of any civilization and any human being, as well as any living organism. The role of water in human life cannot be overestimated, which is why a resolution of the United Nations General Assembly states that "the right to safe, clean drinking water and sanitation is a necessary right to enjoy life and human rights to the full".
Technologies are developing ever so fast, which triggers changes to happen in leaps and bounds across different sectors.
The lens is an important element of the eye of mammals, birds, reptiles, amphibians, and fish. It allows one to see objects located at different distances clearly. It is possible because images are formed on the retina - another important part of the eye. Clear images are achieved by changes in the shape of the lens.